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Future electric vehicles (EVs) will be linked to the electric power system infrastructure; the vehicles will operate through frequent electric charging, as is the case with electric trains. Conventional batteries require a long recharging time; therefore, supercapacitors, rather than batteries, will play an important role in the future for charging of EVs. Recently, we manufactured small EVs powered...
In this paper, we introduce a novel DC-DC converterless ultracapacitor electric vehicle (EV) and propose methods to cope with voltage variation of ultracapacitor. In general capacitor applications, a DC-DC converter is used to suppress ultracapacitor's voltage variation. In the case of the proposed EV, the ultracapacitor storage system is directly connected to an inverter for the purpose of weight,...
The paper focuses on a method to interface a power buffer based on supercapacitors (SCs) to a system with a stiff DC voltage. An optimized design methodology is given, showing that the proposed system is able to fully control the power flow between the SCs and the DC-link, making use of reduced-rating switching devices and magnetic components. Losses of the proposed system are analytically evaluated...
A converter topology suitable for bidirectional power flow control between a supercapacitor bank and a stiff voltage source is presented. Main feature of the topology is the reduced ratings of the solid state devices used in the converter, as compared to conventional solutions. For the same capabilities in terms of energy extraction, reduction of up to 50% in the ratings of the silicon switching devices...
This paper presents the novel electric vehicle powered only by "electrical double layer capacitors (EDLC)" and the vehicle motion control using this vehicle. This vehicle provides easy experiment of electric vehicle motion control, since capacitor has the peculiar characteristic of large current charging. In this paper, the driving experimental data are shown first and capacitance monitoring...
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